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  1. Go to Virtual datacenters 

  2. Select a virtual datacenter or All virtual datacenters

  3. Go to Alarms

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  1. Configure the metrics you will use in the alarm. See VM monitoring and metrics and Custom metrics resources.

  2. As a shortcut, to create an alarm on a specific VM metric, you can go to the metric display and click the Create alarm symbol

    Shortcut to create an alarm for a metric

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  1. Go to Virtual datacenter → Alarms

  2. Select virtual datacenter, virtual appliance, scaling group, or VM

  3. Click the + add button

  4. Enter the alarm details

    Create an alarm for a VM with general detailsImage RemovedCreate an alarm for a VM with general detailsImage Added

  5. Enter the alarm metric details, and for more information, see the Alarm UI fields table below.

    Create an alarm for a VM selecting a metric and entering a thresholdImage Removed Create an alarm for a VM selecting a metric and entering a thresholdImage Added

  6. Click Save

Alarm UI fields table

Field

Description

Entity type

Select an entity with metrics from the list on the left.

Entity name

The name of the entity

Entity label

The label of the entity, which for VMs is shown in the list on the left

Entity icon

The icon that the platform displays in the UI for VMs and virtual appliances

Name

Name of the alarm with up to 128 characters. Alarm names must be unique for each metric

Description

Description of the alarm. Used together with the alarm name and VM name to identify the alarm, for example, when creating an alert

Metric

Select one of the metrics available for the VM

Metric unit

The unit of the metric. Read only

Metric description

The description of the metric. Read only

Dimension

When the metric has multiple dimensions, optionally select one or more dimensions.
For example, if a VM has multiple hard disks, then the disk read bytes metric may have a dimension for each disk

Last datapoints in period

The number of datapoints that the platform will evaluate for the metric during the elapsed time.

If you request the evaluation of an alarm more frequently than
metric data is collected by the platform or sent by the provider, then the alarm will not activate.

We recommend that you create alarms with longer evaluation periods, for example,
an average of 10 points over the last hour, so the transmission and collection intervals will not affect the activation of the alarm.

Statistic

Statistic that the platform will use for evaluating the alarm, which can be: average, maximum, minimum, sum, count, dev

Formula

Operator that the platform will use for evaluation of the alarm, for example, greater thansuch as, greaterthan.
Values can be: notequal, greaterthan, greaterthanorequalto, lessthan, lessthanorequalto, trendup, trenddown

Threshold

Value that the platform will evaluate the alarm against, if appropriate

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The platform will create the alarm for the metric. If you would like the platform to notify you when an alarm is triggered, create an Alert.

Note

Troubleshooting alarms that do not trigger

  • The minimum value of the time period to evaluate alarms is 1 minute, but the platform collects metrics data every 2 minutes by default. The administrator can also configure the time for each hypervisor or provider.

  • For the default configuration, to ensure that an alarm will activate, you should set the alarm to evaluate every 2 minutes as a minimum.

  • In addition, each provider sends metrics at different intervals, for example, with Amazon Basic monitoring, data is sent every 5 minutes, and with Advanced monitoring, every minute. In contrast, for vCloud, data is available on consultation.

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You can delete any alarm at any time, even if it is part of one or more alerts. The platform will not warn you that the alarm is used in an alert. However, you can check this in Control view. After you delete an alarm, you cannot recover it.

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